Wide-range, fast, and high-precision scanning is a key technology in the fields of electro-optical de.tection, laser radar and infrared countermeasures. It is difficult to balance these indicators with traditional scanningmethods. Firstly, the advantages of rotational double prisms for wide-range, fast and high-precision scanning are ana.lyzed. Secondly, the principle and method of forward and reverse scanning are introduced, and different algorithmsof reverse scanning such as first-order approximation method and vector optical method are analyzed. Finally, the ro.tational double prisms fast scanning simulation system is established. The validity and accuracy of the two reversescanning methods are verified and tested. The results show that, in the scanning range of ±1.5°, the accuracy of thefirst order approximation is about 20", and the vector optical method is about 1". A new technical approach is pro.vided for wide-range, fast and high precision scanning applications.